I have a feeling it's something like, "You're not prepared to deal with today's problems and you know it" or something like that. Thor ended his confrontation with Roxxon feeling pretty broken because he was completely out of his depth the whole time, unable to deal with Dario Aggers' strategies, which relied on modern conventions like legal technicalities and government sanctions. It, um... it didn't make a whole lot of sense, given that Thor lived as a modern man in the modern world for at least a decade (his life as Don Blake began on Blake's first day in medical school), but that seems to be the greatest failure Aaron's set up for Thor, at least in Thor's own mind.